As expected, incubation with ACE2 blocking antibody two hours before infection with SARS-CoV-2 virus markedly reduced the viral protein (SARS-CoV-2 N protein) in the co-cultures of iLungs with iMφs or 293T cells, compared to those co-cultures without ACE2 blocking (Fig. 5f). This evidence concerns the gene ACE2 and infection.